54 PROCEEDINGS OF THE NATIONAL MUSEUM. vol, 63. 



scutellum; median lobe of mesonotum with two short, prominent, 

 longitudinal ridges anteriorly and a distinct median longitudinal 

 furrow extending from its anterior border to its apical third, sha- 

 greened in this furrow and toward the apex ; lateral lobes very slightly 

 shagreened in their inner posterior corners, othermse polished, hair- 

 less; scutellum transverse, flattened, margined laterally, polished 

 (except on sides where it is faintly shagreened), from the middle 

 sloping abruptly posteriorly to the propodeum; metapleurae, propo- 

 deum laterally, first tergite sparsely on the sides, and basal foveae 

 proximally, covered with short white hair; abdomen twice as long as 

 the head and thorax united, broad and very much flattened, the second 

 tergite distinctly wider than the thorax across the tegulae; first tergite 

 a little over twice as wide as long; median area quadrate, elevated, 

 tlie dorsolateral ridges sharp and prominent, elevated anteriorly and 

 })Osteriorly, a longitudinal carina traversing the depression but not 

 attaining either end of the segment; second tergite three-fifths as 

 wide at apex as long, not much narrowed basally, the sides on apical 

 half nearly parallel, very slightly curved, anteriorly abruptly curved; 

 basal foveae short and deep, with a few faint striae confined within 

 their borders, the space between the foveae with a few faint striae half 

 their length; abdomen beyond the apex of the second segment gradu- 

 ally narrowing to tip; third tergite as long as wide at base, slightly 

 narrower posteriorly, the sides straight; fourth as long as wide at apex, 

 a Mttle broader basally, haK as wide through the middle as the second 

 tergite apically; fifth two-thirds as wide as long, the sides parallel, a 

 little narrower than the fourth medially; six as long as the fifth, as 

 wide as long, sharply pointed apically, unsculptured, with a fringe of 

 hairs laterally; wings hyaline, extending to apex of fourth segment. 

 Black; legs and antennae piceous. 



Type locality. — Palmerlees Ranch, Oregon. 



Type. — Cat. No. 25436, U.S.N.M. Paratype in Collection Fonts. 



Described from two female specimens from Palmerlees Ranch, 

 Oregon, reared by J. E. Patterson, September 8, 1915, from the cones 

 of Abies shastensis, and recorded in the Bureau of Entomology under 

 Hopkins U. S. No. 14200m. 



The species is probably parasitic on some Cecidomyid inhabiting 

 the cone. 



The extraordinary flatness of the body and the peculiar structure 

 of the mesonotum serve to distinguish the species from closely allied 

 ones. 



22. PLATYGASTER LUCIDA, new species. 



Female. — Length 2 mm. Shape of body somewhat similar to that 

 found in the females of shastensis, the abdomen just as fiat as in that 

 species but the thorax less depressed, higher than wide; head rather 

 finely shagreened, more finely on the frons just above the antennae 



